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Acquisitions - 2021 Acquisition Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
Earnings per Share Attributable to Kadant |  |  |
Cost of revenue | $ 449,214 | $ 357,722 | $ 410,884
Selling, general, and administrative expenses | 208,787 | 181,905 | $ 192,525
Clouth |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Revenue | 812,016 | 682,248 |
Net Income Attributable to Kadant | $ 90,184 | $ 55,760 |
Earnings per Share Attributable to Kadant |  |  |
Basic (in dollars per share) | $ 7.79 | $ 4.86 |
Diluted (in dollars per share) | $ 7.74 | $ 4.82 |
Clouth | Inventory revalued |  |  |
Earnings per Share Attributable to Kadant |  |  |
Cost of revenue | $ 3,082 | $ 3,082 |
Clouth | Acquisition-related Costs |  |  |
Earnings per Share Attributable to Kadant |  |  |
Selling, general, and administrative expenses | 2,710 | 3,109 |
Amortization | $ 399 |  |
Clouth | Forgiveness Of Shareholder Loan |  |  |
Earnings per Share Attributable to Kadant |  |  |
Pre-tax gain from loan forgiveness |  | $ 4,409 |

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